Pulverizer



F. B. FRANKS.

PULVEHIZER.

APPLICATION man' APH. 1i. 1918.

Patented 15%. 21;.1920.

2 SHEETS-SHEET l.

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l! AY w W I UNITED STATES PATEN'l QFFICE.

FREDERICK B. FRANKS, 0F BATH, PENNSYLVANIA.

PULVERIZER.

Application led April 11,

To all 2li/2.0m t may concern:

Be it known that I, F nnnnnrcii B. FRANKS, a citizen of the United States, and a resident of Bath, county of Northampton, State of Pennsylvania, have invented certain Improvements in Pulverizers, of which the fol lowing is a specification.

My invention relates to certain improvements in a pulverizer for which Letters Patent were granted to me on the 7th day of November, 1916,/ No. 1,204,385.

One object of my present invention is to construct a yoke so that the pushing arms can be renewed, when broken, without discarding the entire yoke structure.

A further object of the invention is to make these arms in separate castings which, when assembled, form a complete ring which can be rigidly secured to the main body of the yoke.

ln the accompanying drawings Figure 1, is a sectional view of suflicient of a pulverizer to illustrate my invention;

Fig. 2, is a detached perspective view of my improved yoke;

Fig. 3, is a plan view of the lower section;

Fig. 4, is a perspective view of the lower section; j

Fig. 5, is a side view showing the lower section made of a series ot segments;

Fig. 6, is a vertical sectional view oi the yoke illustrated in Fig. 5, through both the upper and the lower sections;

Fig. 7, is a plan view, showing the seg mental lower section; and

Fig. 8, is a perspective view of one of the segmental arms.

Pulverizers of the type 'illustrated are subjected to a considerable strain and shocks and it often occurs that one of the pushing arms of the yoke, which propels the pulverizing balls in their circular path, breaks due to the strain to which the arms are subjected and, consequently, a new yoke has to be substituted for the broken one.

I have found that, by making the section carrying the arms separate from the main body of the yoke, l can make a more peri'ect casting than where it is made in one piece. Moreover, the section having the arms can be made of a tougher metal than the body portion of the yoke.

Referring to Fig. 1, which illustrates sutfcient of a pulverizer to illustrate my i11- vention, 1 is a grinding ring mounted on Specicaton of Letters Patent.

1918. Serial No. 227,957.

the intermediate section 2 supported on any suitable'base. Located on the intermediate section .is an upper section 4 in which is a screen This type of machine is fully illustrated in the above mentioned patent.

6 is a vertical shaft driven in any suitable manner. This shai't extends through the projection 7 of the central section of the machine and carried by this shaft is a shouldered support 8 on which is mounted the hub 9 of the yoke 10. The support and the opening in the hub are so formed that the yoke must turn with the shaft. ylhe yoke is made in two sections 11 and 12; the upper section 1l is the body section and carries the diagonal brackets 13 and the vertical arms 14 to which the blades 15 and 16, respectively, are attached. The diagonal blades lit't the powdered material, as it is formed, and the vertical blades 16 catch this powdered material and direct it against the screen 5.

On the lower section, in the present instance, are four arms 17 which carry the pushers 18, and mounted in front of each pusher is a ball 19. The balls travel against the grinding ring 1. rThe lower section 12 is secured to the upper section 1l of the yoke by a series of vertical bolts 2O and, in order to relieve the bolts from strain and to couple the lower arm section rigidly with the main upper section 11, I provide the upper section with a series of radial projections 2l, which are spaced apart and enter recesses 22 between the radial projections 23 on the lower section so that, when the parts are bolted together, the lower section is driven through the positive coupling.

In the construction shown in Figs. 1 to 4, inclusive, the tour arms 17 are made integral with the lower section 12, but in Figs. 5 to '8, inclusive, I have illustrated a construction in which each of the arms 17a forms an integral part of a segment 12aL having projections 28a which interlock with projections 21a on the body section 11a, and in order to Patented Dec. 21, 1920. j

hold these sections in position against ceny tion by the upper section and the centriful gal action due to the rotation of the yoke.

Thus it will be seen, by the-above conmore substantial yoke for pulverizers than heretofore and one in which the parts which are likely to break can be readily replaced without discarding the entire yoke structure. I can make the arms of the lower section of different material from thebody of the yoke and of a material which will Ywithstand the strains to which the arms are subjected.

I claim l. The combination in a pulverizer, of

a casing having a pulverizing ring; a rotating shaft; a yoke driven by the shaft, said yoke being made in two sections, the upper section carrying a hub', diagonal brackets, and verticalarms to which blades are secured; the lower section having arms; balls driven around the ring by said arms; and means for coupling the two sections of the yoke'rigidly together.

2. A yoke for a pulverizer of the type in which balls are driven over a grinding ring,

said yoke consisting of upper and lower sections, the upper section carrying the hub and the lower section having arms arranged to propel the balls; and means for rigidly connecting the two sections.

3. The combination in a pulverizer of the type in which a series of balls are caused to travel over a grinding ring, of a yoke having upper and lower sections, the upper section being the main body section and having a hub and arms and brackets to which the blades are secured; the lower section having a series of rotating arms for propelling the balls; the upper section having a series of projections spaced apart and adapted to extend into recesses formed by projections on the lower section; and means for securing the two sections together.

4. The combination in a yoke for` a pulverizer of the type in which the balls are caused to travel over a grinding ring, said yoke having an upper and a lower section, the upper section having a hub and a driving shaft on which the hub is mounted, the lower section consisting of a series of segments having projections interlocking with the projections on the upper section, and each segment having an arm for propelling a ball; and ,vertical bolts connecting the segments of the lower section with the upper section.

5. The combination in a yoke for pulverizers, of a lower section carrying'a hub adapted to the driving shaft; a lower section consisting of a series of segments, each segment having an arm; a projection on eachsegment, said projections being less in width than the segment forming a recess; an upper section having recesses arranged to receive the-projections on the segments and having an annular flange extending into the recesses of the segments; and vertical bolts securing the Ysegments to the upper section.

G. A yoke for pulverizing mills, comprising a pusher member having outwardly directed arms and also having an upwardly Vextending portion, a fan center separate from said pusher member having a downwardly directed portion resting upon said first mentioned portion, said fan center having means for supporting a plurality of fan blades, and means passing through said portions for securing together said fan center and pusher member.

7. A yoke for pulverizing mills, comprising a pusher member having outwardly directed arms, a fan center separate from said pusher member and resting upon the latter, interlocking projections disposed on the contacting surfaces of said pusher member and fan center, and bolts for detachably securing together said fan center and pusher member.

8. A pusher member for pulverizer mill yokes having outwardly directed arms, and an upwardly extending portion adapted to support a fan center thereon.

9. A fan center for pulverizer mills having means for supporting a plurality of fan blades, and a downwardly extending portion adapted to rest upon a pusher member.

10. A yoke for pulverizingV mills, comprising a pusher member having outwardly directed arms and also having an upwardly extending portion, a fan center separate from said pusher member having a downwardly directed portion resting upon said first mentioned portion, said fan center having means for supporting a plurality of fan blades, and said portions beingv provided with interlocking projections preventing relative lateral movement between said pusher member and said fan center.

11. A yoke for pulverizing millscomprising a pusher member having outwardly directed arms, a fan` center separate from said pusher member and resting upon the latter, said fan center having means for supporting a plurality of fan blades, and bolts passing through said fan center and pusher member detachably securing them together.

12. A yoke for pulverizing mills, comprising a pusher member having outwardly directed arms and also having an upwardly extending portion, a fan center separate from said pusher member having a downwardly directed portion resting upon said first mentioned portion, said fan center having means for supporting a plurality of fan blades, and bolts passing through said por-` tions and the body of the fan center and pusher member detachably securing the two together. Y

In witness whereof I aix my signature.

FREDERICK B. rRANKs. 

